PA

UK [ˌpiː ˈeɪ] / US [ˌpɪ ˈeɪ] noun [countable]
Word forms "PA":
singular PA plural PAs

1) personal assistant: someone whose job is to help a manager by writing business letters, organizing meetings etc

See:

secretary

2) PA or PA system public address system: a set of electrical equipment that makes sounds louder, used especially for making announcements to a group of people or for playing music in a public place